JP3892409B2

JP3892409B2 - Skewer pile creation device

Info

Publication number: JP3892409B2
Application number: JP2003113636A
Authority: JP
Inventors: 成梧西本; 淳一絹田
Original assignee: 成梧西本; 株式会社絹田熔工
Priority date: 2003-04-18
Filing date: 2003-04-18
Publication date: 2007-03-14
Anticipated expiration: 2023-04-18
Also published as: JP2004316309A

Description

【０００１】
【発明の属する技術分野】
本発明は、地盤を掘削しながら、その掘削土壌にセメントミルク（固化材）を注入して攪拌し、地盤中にソイルセメント杭を造成する装置に関するもので、特に、杭本体部の中間に一つ又は複数の拡径部を形成した串状のソイルソメント杭を造成する串杭造成装置に関する。
【０００２】
【従来の技術】
従来の串杭造成装置についは、公知文献を具体的に挙げることは出来ないが、内部をセメントミルク供給路とする中空管の下端部に主掘削刃が設けられ、この主掘削刃より上方部に、主掘削刃より径小に折り畳まれる折畳姿勢と、主掘削刃よりも径大に拡開される拡開姿勢とに姿勢変更する掘削爪が設けてあって、この掘削爪は、中空管を正転させる時に折畳姿勢に折り畳まれ、それを逆転させる時に拡開姿勢に拡開されるようになっている。
【０００３】
【発明が解決しようとする課題】
上記のような従来の串杭造成装置では、杭の拡径部を形成する際に掘削爪が地盤中で折畳姿勢から拡開姿勢に拡開しているのかどうかを地上で確認することが出来ないことから、実際に地盤中に拡径部が形成されて串杭が確実に造成されているかどうか分からなかった。
【０００４】
本発明は、杭拡径部の形成時に拡径孔用掘削爪が地盤中で拡開姿勢に拡開しているかどうかを地上に確認でき、それによって確実に串杭を造成できるようにした串杭造成装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
請求項１は、杭本体部３１ａの中間に一つ又は複数の拡径部３１ｂを形成した串状のソイルソメント杭３１を地盤Ｇ中に造成する串杭造成装置であって、リーダ１に沿って昇降可能なオーガマシン２に連動連結される内管３に外管４を回転自在で上下動自在に套嵌し、内管３には下端部に主掘削刃５を取り付けると共に主掘削刃５より上方部に拡径孔用掘削爪６を取り付け、この拡径孔用掘削爪６は、常時は縮径姿勢に折り畳み、拡径孔掘削時には外管４をリーダ１側に固定した状態で内管３を所定ストロークＳ下動させることによって拡径姿勢に拡開するように、リンク部材７を介して外管４に対し回転自在に連結されていることを特徴とする。
【０００６】
請求項２は、請求項１に記載の串杭造成装置において、内管３の上端部には、拡径孔用掘削爪６が縮径姿勢に折り畳まれた状態で内管３が正転する時は内管３に対する外管４の上動を阻止し、内管３の逆転時には内管３に対する外管４の上動を許すストッパー８を設けてなることを特徴とする。
【０００７】
請求項３は、請求項１又は２に記載の串杭造成装置において、内部３ａをセメントミルク供給路とする内管３には主掘削刃取付位置と拡径孔用掘削爪取付位置とに夫々セメントミルク吐出口２３，２４を設け、拡径孔用掘削爪取付位置にあるセメントミルク吐出口２４を開閉するための剛性板からなる開閉板２５を外管４のリンク部材連結部に設け、この開閉板２５は、拡径孔用掘削爪６が縮径姿勢の時には前記吐出口２４を閉じ、内管３が外管４に対し所定ストロークＳ下動して拡径孔用掘削爪６が拡径姿勢になった時に前記吐出口２４を開くようになっていることを特徴とする。
【０００８】
請求項４は、請求項３に記載の串杭造成装置において、拡径孔用掘削爪取付位置にあるセメントミルク吐出口２４には、内管内部３ａのセメントミルクの供給圧力により外側へ屈曲して開くゴム状弾性体からなる開閉弁２６を設け、この開閉弁２６の外側に前記開閉板２５を設けてなることを特徴とする。
【０００９】
【発明の実施の形態】
図１は本発明に係る串杭造成装置の全体側面図、図２の（ａ）〜（ｄ）は串杭造成装置の構成部材を示す側面図、図３は後述する拡径孔用掘削爪６が縮径姿勢にある串杭造成装置の拡大側面図、図４は拡径孔用掘削爪６が拡径姿勢に拡開された串杭造成装置の拡大側面図である。先ず、図１において、１はクローラクレーンＫによって立設支持されたリーダ、２はリーダ１に沿って昇降駆動されるオーガマシン２である。
【００１０】
３はオーガマシン２に正逆回転自在に連動連結された内管で、内部３ａ（図６参照）をセメントミルク供給路としている。この内管３には外管４が回転自在にして且つ上下動自在に套嵌されている。また内管３には、下端部に主掘削刃５が取り付けられると共に、主掘削刃５の上方所要部に両側一対の拡径孔用掘削爪６，６が取り付けられ、これら拡径孔用掘削爪６，６は、常時は縮径姿勢に折り畳み、拡径孔掘削時には外管４をリーダ１側に固定した状態で内管３を所定ストロークＳ下動させることによって拡径姿勢に拡開するように、一対のリンク部材７，７を介して外管４に対し回転自在に連結されている。
【００１１】
８は、拡径孔用掘削爪６が縮径姿勢に折り畳まれた状態で内管３が正転する時は内管３に対する外管５の上動を阻止するが、内管３の逆転時には内管３に対する外管４の上動を許すストッパーである。９はリーダ１の下端部に設けられた振れ止めで、この振れ止め９には、拡径孔掘削時に外管４をリーダ１側に固定するための外管掴持固定手段１０が設けられている。
【００１２】
上記串杭造成装置の構造について更に詳細に説明すると、図２の(a) は主掘削刃５と拡径孔用掘削爪６とを取り付けた内管３の側面図、(b) は外管４の側面図、(c) は(a) のＸ−Ｘ線に沿った断面図、(d) はリンク部材７の側面図である。(a) に示すように、拡径孔用掘削爪６は、主掘削刃５の取り付けられた内管３の下端部から所要高さにある両側対称位置に夫々基端部がピン１０で内管３に枢着されている。
【００１３】
また図２の(b) に示すように、外管４の下端部には攪拌枠兼用のリンク部材連結枠１１が回転自在に設けられている。この連結枠１１は、外管４の下端部に回転自在に外嵌され、上下のフランジ部１２，１２によって軸方向の移動を阻止された基筒部１１ａと、この基筒部１１ａの両側対称位置に突設された攪拌翼１１ｂ，１１ｂとからなる。組立にあたっては、外管４を内管３に套嵌した状態で、各攪拌翼１１ｂの基端部と各拡径孔用掘削爪６の中間部とをリンク部材７によってピン１３，１４で枢支連結することによって、各拡径孔用掘削爪６は、常時は図３のような縮径姿勢に折り畳まれ、拡径孔掘削時には外管４をリーダ１側に固定した状態で内管３を所定ストロークＳ下動させることにより図４に示すように拡径姿勢に拡開するようになっている。尚、外管４は、常時はその自重及び下端部に取り付けられたリンク部材連結枠１１、拡径孔用掘削爪６等の重量により、図３に示すような下限位置（拡径孔用掘削爪６が縮径姿勢に折り畳まれた位置でもある）まで下降した状態にある。
【００１４】
前記ストッパー８は、図２〜図４に示すように一端部が内管３の上端部にピン１５で枢着され、他端部にローラー１６を軸着した揺動片１７からなるもので、常時は自重により一端面が内管３の上端フランジ部１８に当接した状態で垂下していて、掘進時のように拡径孔用掘削爪６が縮径姿勢に折り畳まれた状態で内管３が正転（図３の矢印ａ方向の回転）する時は、内管３に対する外管５の上動を阻止し、そして引き上げ時のように拡径孔用掘削爪６が折り畳まれた状態で内管３が逆転（図３の矢印ｂ方向の回転）する時は、揺動片１７が図３の実線図示位置から仮想線図示位置へと揺動して、内管３に対する外管４の上動を許すようになっている。
【００１５】
拡径孔掘削時に外管４をリーダ１側に固定する前記外管掴持固定手段１０は、図５に一例を示すように、振れ止め９の直径方向両側対称位置に配設されたシリンダ２０，２０と、両シリンダ２０，２０の伸縮作動により振れ止め９内の外管４に対し進退移動して掴持・離間するチャック片２１，２１とからなるもので、両シリンダ２０，２０の伸長作動時にチャック片２１，２１が外管４を掴持して固定するようになっている。図３〜図５において、２２はリーダ１から延びて振れ止め９を支持するアームである。
【００１６】
内管３は、その内部３ａをセメントミルク供給路としたもので、この内管３には主掘削刃５の取付位置と拡径孔用掘削爪６の取付位置とにセメントミルク吐出口２３，２４が設けられている。図６に示すように、拡径孔用掘削爪６の取付位置にあるセメントミルク吐出口２４を開閉するための鋼板等の剛性板からなる開閉板２５が、外管４に取り付けてあるリンク部材連結枠１１に設けられ、またセメントミルク吐出口２４には、図６の(b) に示すように内管３のセメントミルク供給路３ａに供給されるセメントミルクの供給圧力により外側へ屈曲して開く合成ゴム板（ゴム状弾性体）からなる開閉弁２６が設けられ、この開閉弁２６の外側に前記開閉板２５が設けられることになる。
【００１７】
図６から分かるように、セメントミルク吐出口２４は、内管３に取り付けられた弁枠２７に形成され、この弁枠２７の外側に合成ゴム板からなる開閉弁２６の上端部が取り付けてある。この開閉弁２６の外側にある開閉板２５は、リンク部材連結枠１１の基筒部１１ａに取り付けられていて、リンク部材連結枠１１及び拡径孔用掘削爪６を介して内管３と一体回転できるようになっており、しかして拡径孔用掘削爪６が縮径姿勢の時には図６の(a) に示すようにセメントミルク吐出口２４を閉じ、同内管３が外管４に対し所定ストロークＳ下動して拡径孔用掘削爪６が拡径姿勢になった時、図の(b) に示すようにセメントミルク吐出口２４を開くようになっている。
【００１８】
この実施形態では、セメントミルク吐出口２４の外側にゴム状弾性体からなる開閉弁２６を設け、その外側に剛性板からなる開閉板２５を設けているが、ゴム状弾性体からなる開閉弁２６を省略し、リンク部材連結枠１１に取り付けた開閉板２５によって直接セメントミルク吐出口２４を開閉するようにしてもよい。尚、内管内部３ａへのセメントミルクの導入は、図１に概略示すように、オーガマシン２に付設された中継タンク２８から延びたミルク導入管２９によって行うようになっている。
【００１９】
上記のように構成される串杭造成装置の使用による串状ソイルソメント杭の造成行程を図７〜図９によって他の図を参照しながら説明する。
【００２０】
先ず、掘削開始にあたって、振れ止め９に設けてある外管掴持固定手段１０のチャック片２１を開放して、外管４の固定を解除しておく。この時、外管４は、その自重及び下端部に取り付けられたリンク部材連結枠１１、拡径孔用掘削爪６等の重量により、内管３に対する上下ストロークＳの下限位置に下降して、拡径孔用掘削爪６が縮径姿勢に折り畳まれた状態にある（図３参照）。
【００２１】
上記の状態でオーガマシン２をリーダ１に沿って下動しつつ、このオーガマシン２によって内管３を正転させながら、内管３下端部の主掘削刃５によって地盤Ｇの掘削を開始する（図７の▲１▼参照）。この主掘削刃５によって、杭本体部形成用の孔３０ａが掘削される。また、杭本体部形成用孔３０ａがある程度の深さまで掘孔されたならば、セメントミルクの供給を開始し、内管３下端部のセメントミルク吐出口２３から掘削土壌中にセメントミルクを吐出させ（図７の▲２▼参照）、内管３の回転に伴って回転するリンク部材連結枠１１の攪拌翼１１ｂによって掘削土壌とセメントミルクとを攪拌混合する。
【００２２】
図７の▲３▼に示すように杭本体部形成用孔３０ａが所定深さ（例えば５ｍ程度）に到達したならば、オーガマシン２の下動を停止した後、このオーガマシン２を上動して、内管３を少しだけ（例えば１ｍ程度）引き上げる（図８の▲１▼参照）。この引き上げた時点で外管掴持固定手段１０を作動してチャック片２１，２１により外管４を掴持した状態でリーダ１側に固定し、この状態でオーガマシン２を下動しながら内管３を所定ストロークＳだけ押し下げてゆくと、拡径孔用掘削爪６，６が図３の縮径姿勢から図４の拡径姿勢へと拡開する。この時、内管３の上端フランジ部１９が図３の位置から図４の位置へとストロークＳ移動するから、地盤Ｇ中で拡径孔用掘削爪６が拡開姿勢に確実に拡開したことを確認できる。
【００２３】
上記のようにして拡径孔用掘削爪６，６が拡径姿勢に拡開したならば、外管掴持固定手段１０による外管４の固定を解除し、引き続きオーガマシン２を下動して内管３及び外管４を少しだけ（例えば０．５ｍ程度）下降させてゆくと、杭本体部形成用孔３０ａが拡径孔用掘削爪６，６により拡径されて、図８の▲２▼に示すような拡径孔３０ｂが掘削されると同時に、この拡径孔３０ｂに掘削土壌とセメントミルクとの混合物が入り込む。この時、外管４側に取り付けてなる開閉板２５が図６の(b) に示すように拡径孔用掘削爪取付位置にあるセメントミルク吐出口２４を開放するように開くから、その内側の開閉弁２６が内管３内部のセメントミルクの圧力によって外側へ弾性変形して吐出口２４を開放し、セメントミルクを吐出させて、上記拡径孔３０ｂ内に行き渡る。
【００２４】
こうして拡径孔３０ｂが掘削された後、外管掴持固定手段１０によって再び外管４を固定する。この状態で、オーガマシン２を少しだけ上動させて内管３を引き上げることにより、拡径姿勢にあった拡径孔用掘削爪６，６を折り畳んで縮径姿勢とした後、外管掴持固定手段１０による外管４の固定を解除し、図９の▲１▼に示すようにオーガマシン２を上動して内管３及び外管４を引き上げ、更に地上へ引き上げ、これによって串杭造成作業が完了する。しかして、杭本体部形成用孔３０ａ及び拡径孔３０ｂ内で掘削土壌と混合したセメントミルクが固化することによって、同図の▲２▼に示すように杭本体部３１ａの中間に一つの拡径部３１ｂを形成した串状のソイルソメント杭、即ち串杭３１が造成される。
【００２５】
上記の串杭造成行程では、杭本体部３１ａの中間に一つの拡径部３１ｂを形成した串杭３１を造成したが、図８の▲１▼及び▲２▼に示される行程を繰り返すことによって拡径部３１ｂを杭本体部３１ａの中間に二つ以上複数形成した串杭３１を造成することができる。
【００２６】
以上説明したような本発明に係る串杭造成装置によれば、両側一対の拡径孔用掘削爪６，６は、常時は縮径姿勢に折り畳み、拡径孔掘削時には外管４をリーダ１側に固定した状態で内管３を所定ストロークＳ下動させることによって拡径姿勢に拡開するように、一対のリンク部材７，７を介して外管４に対し回転自在に連結されていて、外管４は、内管３に対して所定のストローク間移動し、そのストロークＳの上限位置にある時には拡径孔用掘削爪６が拡径姿勢にあり、下限位置にある時は縮径姿勢にあるから、串杭３１の拡径部３１ｂを形成する際に、拡径孔用掘削爪６が地盤中で縮径姿勢から拡開姿勢に拡開しているのかどうかは、地上に突出している内管３の上端位置、例えば内管３の上端フランジ部１９の位置を外管４の上端フランジ部１８との間隔で確認すればよく、しかして内管３の上端フランジ部１９が外管４の上端フランジ部１８に接近しておれば、確実に拡開姿勢に拡開しており、離れておれば、拡開していないため、地盤中に実際に拡径部が形成されているかどうかを確実に把握することができる。またこの場合、外管４に対する内管３の移動をリミットスイッチの位置検出手段で検出することによって、拡径孔用掘削爪６の拡開状態を地上でより一層確実に把握できる。
【００２７】
また、この串杭造成装置では、内管３の上端部に、拡径孔用掘削爪６が縮径姿勢に折り畳まれた状態で内管３が正転する時は内管３に対する外管４の上動を阻止し、内管３の逆転時に外管の上動を許すストッパー８が設けられているから、掘進作業中に内管３が浮き上がって拡径孔用掘削爪６が不測に拡開するのを防止することができる。
【００２８】
更に、この串杭造成装置では、内部３ａをセメントミルク供給路とする内管３には主掘削刃取付位置と拡径孔用掘削爪取付位置とに夫々セメントミルク吐出口２３，２４が設けられているが、拡径孔用掘削爪取付位置にあるセメントミルク吐出口２４にはこれを開閉するための開閉板２５が外管４のリンク部材連結部に設けてあって、この開閉板２５は、拡径孔用掘削爪６が縮径姿勢の時には吐出口２４を閉じ、内管３が外管４に対し所定ストロークＳ下動して拡径孔用掘削爪６が拡径姿勢になった時吐出口２４を開くようになっているから、拡径孔３０ｂを掘削する際には拡径孔用掘削爪６の取付位置にある吐出口２４からセメントミルクを吐出させて、良質の拡径部３１ｂを形成することができ、そして杭本体部形成用孔３０ａの掘削時には、拡径孔用掘削爪取付位置にある吐出口２４からのセメントミルクの吐出を止めて、内管３先端部の主掘削刃取付位置にある吐出口２３からのみセメントミルクを吐出させ、余分なミルクの吐出を阻止できる。
【００２９】
また、この実施形態では、拡径孔用掘削爪取付位置にあるセメントミルク吐出口２４に、内管内部３ａのセメントミルクの供給圧力により外側へ屈曲して開くゴム状弾性体からなる開閉弁２６が設けられ、この開閉弁２６の外側に前記開閉板２５が設けられているから、拡径孔用掘削爪取付位置にあるセメントミルク吐出口２４をゴム状弾性体の開閉弁２６によって確実に閉鎖することができる。
【００３０】
【発明の効果】
請求項１に係る発明の串杭造成装置によれば、拡径孔を掘削する際に、拡径孔用掘削爪が地盤中で縮径姿勢から拡開姿勢に拡開しているのかどうかは、内管と共に地上に突出している外管の上端位置を地上で確認すればよく、外管の上端位置が内管の上端位置に接近した上限位置にあれば、拡径孔用掘削爪が確実に拡開姿勢に拡開しており、また内管の上端位置から離れた下限位置にあれば、拡開していないため、地盤中に実際に拡径部が形成されているかどうかを確実に把握できる。
【００３１】
請求項２に係る発明の串杭造成装置によれば、内管の上端部に、拡径孔用掘削爪が縮径姿勢に折り畳まれた状態で内管が正転する時は内管に対する外管の上動を阻止し、内管の逆転時に外管の上動を許すストッパーが設けられているから、掘進作業中に内管が浮き上がって拡径孔用掘削爪が不測に拡開するのを防止することができる。
【００３２】
請求項３に係る発明の串杭造成装置によれば、拡径孔用掘削爪取付位置にあるセメントミルク吐出口にはこれを開閉する開閉板が外管のリンク部材連結部に設けてあって、この開閉板は、拡径孔用掘削爪が縮径姿勢の時には吐出口を閉じ、内管が外管に対し所定ストローク下動して拡径孔用掘削爪が拡径姿勢になった時に吐出口を開くようになっているから、拡径孔を掘削する際には拡径孔用掘削爪取付位置にある吐出口からセメントミルクを吐出させて、良質の拡径部を形成することができ、そして杭本体部形成用孔の形成時には、拡径孔用掘削爪取付位置にある吐出口からのセメントミルクの吐出を止めて、内管先端部の主掘削刃取付位置にある吐出口からのみセメントミルクを吐出させ、余分なミルクの吐出を阻止できる。
【００３３】
請求項４に係る発明の串杭造成装置によれば、拡径孔用掘削爪取付位置にあるセメントミルク吐出口に、内管内部のセメントミルクの供給圧力により外側へ屈曲して開くゴム状弾性体からなる開閉弁を設け、この開閉弁の外側に前記開閉板を設けているから、拡径孔用掘削爪取付位置にあるセメントミルク吐出口をゴム状弾性体の開閉弁によって確実に閉鎖することができる。
【図面の簡単な説明】
【図１】本発明に係る串杭造成装置の全体側面図である。
【図２】（ａ）〜（ｄ）は串杭造成装置の構成部材の側面図である。
【図３】拡径孔用掘削爪が縮径姿勢にある串杭造成装置の拡大側面図である。
【図４】拡径孔用掘削爪が拡径姿勢に拡開された串杭造成装置の拡大側面図である。
【図５】振れ止めに設けた外管掴持固定手段を示す横断面図である。
【図６】 (a) は拡径孔用掘削爪取付位置のセメントミルク吐出口が開閉板によって閉じられた状態を示す縦断面図、(b) は開閉板が同セメントミルク吐出口を開放した状態を示す縦断面図である。
【図７】 ▲１▼〜▲３▼は本発明に係る串杭造成装置の使用による串杭造成行程を示す説明断面図である。
【図８】 ▲１▼及び▲２▼は図７に続く串杭造成行程を示す説明断面図である。
【図９】 ▲１▼及び▲２▼は図８に続く串杭造成行程を示す説明断面図である。
【符号の説明】
１リーダ
２オーガマシン
３内管
４外管
５主掘削刃
６拡径孔用掘削爪
７リンク部材
８ストッパー
２３内管の主掘削刃取付位置にあるセメントミルク吐出口
２４内管の拡径孔用掘削爪位置にあるセメントミルク吐出口
２５開閉板
２６開閉弁
３０ａ杭本体部形成用孔
３０ｂ拡径孔
３１串杭
３１ａ杭本体部
３１ｂ拡径部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for injecting cement milk (solidification material) into the excavated soil while excavating the ground and stirring the soil to create a soil cement pile in the ground. The present invention relates to a skewer pile forming apparatus for forming a skew-shaped soil soment pile having one or more enlarged diameter portions.
[0002]
[Prior art]
Regarding the conventional skew pile building device, publicly known documents cannot be specifically mentioned, but a main drilling blade is provided at the lower end portion of the hollow pipe having the inside as a cement milk supply passage, and is located above the main drilling blade. In the part, a drilling claw that changes its posture to a folding posture that is folded smaller than the main drilling blade and an expanded posture that is expanded to a diameter larger than the main drilling blade is provided. When the hollow tube is rotated forward, it is folded into a folded position, and when it is reversed, it is expanded into an expanded position.
[0003]
[Problems to be solved by the invention]
In the conventional skewer pile forming apparatus as described above, it is possible to confirm on the ground whether or not the excavation claw is expanded from the folded position to the expanded position in the ground when forming the expanded portion of the pile. Since it was not possible, it was not known whether the enlarged diameter part was actually formed in the ground and the skewer pile was constructed reliably.
[0004]
According to the present invention, it is possible to confirm on the ground whether or not the drilling pawl for the expansion hole is expanded in the expanded position in the ground when the pile expanded portion is formed, and thereby the skewer pile can be surely created. An object is to provide a pile building device.
[0005]
[Means for Solving the Problems]
Claim 1 is a skewer pile forming device for forming a skew-shaped soil soment pile 31 in the ground G in which one or a plurality of enlarged diameter portions 31b are formed in the middle of the pile main body portion 31a. An outer tube 4 is rotatably fitted to an inner tube 3 that is linked to an auger machine 2 that can be moved up and down, and a main excavating blade 5 is attached to the lower end of the inner tube 3 and from the main excavating blade 5. The diameter expansion hole excavation claw 6 is attached to the upper part, and the diameter expansion hole excavation claw 6 is normally folded into a reduced diameter posture, and the outer pipe 4 is fixed to the reader 1 side during the diameter expansion hole excavation. It is characterized in that it is rotatably connected to the outer tube 4 via a link member 7 so as to expand to a diameter-expanded posture by moving 3 downward by a predetermined stroke S.
[0006]
According to a second aspect of the present invention, in the skewer pile forming device according to the first aspect, the inner pipe 3 is normally rotated at the upper end portion of the inner pipe 3 in a state where the digging claw 6 for the enlarged-diameter hole is folded in a reduced diameter posture. The stopper is provided with a stopper 8 that prevents the outer tube 4 from moving upward with respect to the inner tube 3 and allows the outer tube 4 to move upward with respect to the inner tube 3 when the inner tube 3 is reversed.
[0007]
The third aspect of the present invention is the skewer pile forming apparatus according to the first or second aspect, wherein the inner pipe 3 having the interior 3a as a cement milk supply passage is provided at a main excavation blade attachment position and an enlarged hole excavation claw attachment position, respectively. Cement milk discharge ports 23 and 24 are provided, and an opening and closing plate 25 made of a rigid plate for opening and closing the cement milk discharge port 24 at the position of attaching the drilling claw for the enlarged diameter hole is provided at the link member connecting portion of the outer tube 4. The opening / closing plate 25 closes the discharge port 24 when the diameter-expanding hole excavation claw 6 is in a reduced diameter posture, and the inner pipe 3 moves downward by a predetermined stroke S relative to the outer pipe 4 to expand the diameter-expanded hole excavation claw 6. The discharge port 24 is opened when a radial posture is achieved.
[0008]
According to a fourth aspect of the present invention, in the skewer pile forming apparatus according to the third aspect, the cement milk discharge port 24 at the position of the diameter claw excavation claw is bent outward by the supply pressure of the cement milk inside the inner pipe 3a. The on-off valve 26 made of a rubber-like elastic body that opens is provided, and the on-off plate 25 is provided outside the on-off valve 26.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an overall side view of a skewer pile forming apparatus according to the present invention, FIGS. 2A to 2D are side views showing components of the skewer pile forming apparatus, and FIG. FIG. 4 is an enlarged side view of the skewer pile forming device 6 in the reduced diameter posture, and FIG. 4 is an enlarged side view of the skewer pile forming device in which the drilling claws 6 for the expanded holes are expanded in the expanded posture. First, in FIG. 1, reference numeral 1 is a leader standing and supported by a crawler crane K, and 2 is an auger machine 2 driven up and down along the leader 1.
[0010]
Reference numeral 3 denotes an inner pipe that is linked to the auger machine 2 so as to freely rotate forward and backward, and the interior 3a (see FIG. 6) serves as a cement milk supply path. An outer tube 4 is rotatably fitted to the inner tube 3 so as to be rotatable and vertically movable. In addition, a main excavation blade 5 is attached to the lower end portion of the inner pipe 3, and a pair of diameter expansion hole excavation claws 6 and 6 are attached to an upper required portion of the main excavation blade 5, and the excavation for these expansion holes is performed. The claws 6 and 6 are normally folded into a reduced-diameter posture, and are expanded to the enlarged-diameter posture by moving the inner tube 3 downward by a predetermined stroke S in a state where the outer tube 4 is fixed to the reader 1 side at the time of excavation of the enlarged-diameter hole. Thus, it is rotatably connected to the outer tube 4 through a pair of link members 7 and 7.
[0011]
8, when the inner pipe 3 rotates forward with the diameter expansion hole excavation claw 6 folded into a reduced diameter posture, the outer pipe 5 is prevented from moving upward relative to the inner pipe 3. It is a stopper that allows the outer tube 4 to move upward relative to the inner tube 3. Reference numeral 9 denotes a steady rest provided at the lower end of the reader 1, and the steady rest 9 is provided with an outer pipe gripping and fixing means 10 for fixing the outer pipe 4 to the leader 1 side at the time of excavation of the enlarged diameter hole. Yes.
[0012]
The structure of the above-mentioned skewer pile forming apparatus will be described in more detail. FIG. 2 (a) is a side view of the inner pipe 3 to which the main excavation blade 5 and the diameter expansion claw 6 are attached, and (b) is the outer pipe. 4 is a side view of FIG. 4, (c) is a cross-sectional view taken along line XX of (a), and (d) is a side view of the link member 7. As shown in (a), the diameter expansion hole excavation claw 6 has a pin 10 at its base end at a symmetrical position at the required height from the lower end of the inner tube 3 to which the main excavation blade 5 is attached. It is pivotally attached to the tube 3.
[0013]
Further, as shown in FIG. 2B, a link member connecting frame 11 serving as a stirring frame is rotatably provided at the lower end portion of the outer tube 4. The connecting frame 11 is rotatably fitted to the lower end portion of the outer tube 4 and is symmetric with respect to both sides of the base tube portion 11a and the base tube portion 11a which is prevented from moving in the axial direction by the upper and lower flange portions 12 and 12. It consists of stirring blades 11b, 11b protruding from the position. When assembling, the outer tube 4 is fitted into the inner tube 3, and the base end portion of each stirring blade 11 b and the intermediate portion of each of the diameter expansion hole excavation claws 6 are pivoted by the pins 13 and 14 by the link member 7. By linking and connecting, each of the diameter expansion hole excavation claws 6 is normally folded into a reduced diameter posture as shown in FIG. 3, and the outer pipe 4 is fixed to the reader 1 side during diameter expansion hole excavation. Is moved downward in a predetermined stroke S to expand to a diameter-expanded posture as shown in FIG. Note that the outer tube 4 always has a lower limit position (extended hole excavation) as shown in FIG. 3 due to its own weight and the weight of the link member connecting frame 11 attached to the lower end, the expanded hole excavation claw 6 and the like. The claw 6 is in a state of being lowered to a position where it is also folded to a reduced diameter posture.
[0014]
The stopper 8 comprises a swing piece 17 having one end pivotally attached to the upper end of the inner tube 3 by a pin 15 and a roller 16 pivotally attached to the other end as shown in FIGS. Normally, the inner pipe is suspended with its one end face in contact with the upper end flange portion 18 of the inner pipe 3 due to its own weight, and the enlarged-hole drilling claws 6 are folded into a reduced-diameter posture as during excavation. When 3 rotates forward (rotation in the direction of arrow a in FIG. 3), the outer tube 5 is prevented from moving upward with respect to the inner tube 3, and the expanded-hole excavation claw 6 is folded as when pulled up. When the inner tube 3 rotates in the reverse direction (rotation in the direction of arrow b in FIG. 3), the swing piece 17 swings from the solid line illustrated position to the phantom line illustrated position in FIG. Is allowed to move up.
[0015]
The outer tube gripping and fixing means 10 for fixing the outer tube 4 to the reader 1 side when excavating the diameter expansion hole, as shown in an example in FIG. , 20 and chuck pieces 21, 21 that move forward and backward with respect to the outer tube 4 in the steady rest 9 by the expansion and contraction operation of both cylinders 20, 20, and are gripped / separated. During operation, the chuck pieces 21 and 21 grip and fix the outer tube 4. 3 to 5, reference numeral 22 denotes an arm that extends from the reader 1 and supports the steady rest 9.
[0016]
The inner pipe 3 has the inside 3a as a cement milk supply path, and the inner pipe 3 is provided with a cement milk discharge port 23, at a position where the main excavation blade 5 is attached and a position where the diameter claw 6 is attached. 24 is provided. As shown in FIG. 6, a link member in which an opening / closing plate 25 made of a rigid plate such as a steel plate for opening / closing the cement milk discharge port 24 at the attachment position of the diameter expansion hole excavation claw 6 is attached to the outer tube 4. As shown in FIG. 6B, the cement milk discharge port 24 provided on the connecting frame 11 is bent outward by the supply pressure of cement milk supplied to the cement milk supply passage 3a of the inner pipe 3. An opening / closing valve 26 made of an open synthetic rubber plate (rubber-like elastic body) is provided, and the opening / closing plate 25 is provided outside the opening / closing valve 26.
[0017]
As can be seen from FIG. 6, the cement milk discharge port 24 is formed in the valve frame 27 attached to the inner pipe 3, and the upper end portion of the on-off valve 26 made of a synthetic rubber plate is attached to the outside of the valve frame 27. . The opening / closing plate 25 outside the opening / closing valve 26 is attached to the base tube portion 11a of the link member connecting frame 11, and is integrated with the inner pipe 3 via the link member connecting frame 11 and the diameter-growing hole excavation claw 6. When the diameter expansion hole excavation claw 6 is in a reduced diameter posture, the cement milk discharge port 24 is closed as shown in FIG. 6 (a), and the inner tube 3 is connected to the outer tube 4. On the other hand, when the diameter expansion hole excavation claw 6 assumes a diameter expansion posture by moving downward by a predetermined stroke S, the cement milk discharge port 24 is opened as shown in FIG.
[0018]
In this embodiment, an opening / closing valve 26 made of a rubber-like elastic body is provided outside the cement milk discharge port 24 and an opening / closing plate 25 made of a rigid plate is provided outside thereof, but the opening / closing valve 26 made of a rubber-like elastic body. The cement milk discharge port 24 may be directly opened and closed by the opening and closing plate 25 attached to the link member connecting frame 11. The introduction of the cement milk into the inner pipe 3a is performed by a milk introduction pipe 29 extending from a relay tank 28 attached to the auger machine 2, as schematically shown in FIG.
[0019]
The process of creating the skewer-shaped soil soment pile by using the skewer pile construction apparatus configured as described above will be described with reference to FIGS.
[0020]
First, at the start of excavation, the chuck piece 21 of the outer tube gripping and fixing means 10 provided in the steady rest 9 is opened, and the fixing of the outer tube 4 is released. At this time, the outer pipe 4 is lowered to the lower limit position of the vertical stroke S with respect to the inner pipe 3 due to its own weight and the weight of the link member connecting frame 11 attached to the lower end, the excavation claw 6 for the enlarged diameter hole, etc. The expanded hole excavation claw 6 is in a state of being folded into a reduced diameter posture (see FIG. 3).
[0021]
In the above state, the excavation of the ground G is started by the main excavation blade 5 at the lower end of the inner pipe 3 while the auger machine 2 is moved down along the leader 1 and the inner pipe 3 is rotated forward by the auger machine 2. (See (1) in FIG. 7). The main excavation blade 5 excavates a hole 30a for forming the pile main body. If the pile body forming hole 30a is dug to a certain depth, the supply of cement milk is started, and the cement milk is discharged into the excavated soil from the cement milk discharge port 23 at the lower end of the inner pipe 3. (See (2) in FIG. 7) The excavated soil and the cement milk are stirred and mixed by the stirring blade 11b of the link member connecting frame 11 that rotates as the inner pipe 3 rotates.
[0022]
As shown in (3) of FIG. 7, when the pile body forming hole 30a reaches a predetermined depth (for example, about 5 m), the auger machine 2 is stopped from moving downward, and then the auger machine 2 is moved up. Then, the inner pipe 3 is slightly lifted (for example, about 1 m) (see (1) in FIG. 8). At this time, the outer tube gripping / fixing means 10 is operated to grip the outer tube 4 with the chuck pieces 21 and 21 and fix it to the reader 1 side. When the pipe 3 is pushed down by a predetermined stroke S, the diameter expansion hole excavation claws 6 and 6 are expanded from the diameter-reduced posture of FIG. 3 to the diameter-expanded posture of FIG. At this time, since the upper end flange portion 19 of the inner pipe 3 moves from the position of FIG. 3 to the position of FIG. 4, the diameter expansion hole excavation claw 6 is reliably expanded in the expanded position in the ground G. I can confirm that.
[0023]
When the diameter expansion hole excavating claws 6 and 6 are expanded to the diameter expansion position as described above, the outer tube 4 is fixed by the outer tube gripping and fixing means 10 and the auger machine 2 is subsequently moved downward. When the inner pipe 3 and the outer pipe 4 are slightly lowered (for example, about 0.5 m), the pile body portion forming hole 30a is expanded by the diameter expanding hole excavating claws 6 and 6, and FIG. At the same time as the diameter expansion hole 30b shown in (2) is excavated, a mixture of excavated soil and cement milk enters the diameter expansion hole 30b. At this time, since the opening / closing plate 25 attached to the outer tube 4 side opens so as to open the cement milk discharge port 24 at the diameter claw mounting claw mounting position as shown in FIG. The on-off valve 26 is elastically deformed outward by the pressure of the cement milk inside the inner pipe 3 to open the discharge port 24 and discharge the cement milk to reach the inside of the diameter expansion hole 30b.
[0024]
After the diameter expansion hole 30b has been excavated in this way, the outer tube 4 is fixed again by the outer tube holding and fixing means 10. In this state, the auger machine 2 is slightly moved upward to pull up the inner tube 3 to fold the expanded-hole drilling claws 6 and 6 in the expanded-diameter posture to a reduced-diameter posture, The fixing of the outer tube 4 by the holding and fixing means 10 is released, and the auger machine 2 is moved up to pull up the inner tube 3 and the outer tube 4 as shown in (1) of FIG. Pile creation work is completed. As a result, the cement milk mixed with the excavated soil is solidified in the pile body forming hole 30a and the diameter expanding hole 30b, so that one expansion is provided in the middle of the pile body 31a as shown in (2) of FIG. A skewer-shaped soil soment pile having a diameter 31b, that is, a skewer pile 31 is formed.
[0025]
In the above-described skewer pile creation process, the skewer pile 31 having one enlarged diameter part 31b formed in the middle of the pile main body part 31a was created. By repeating the processes shown in (1) and (2) in FIG. The skewer pile 31 which formed two or more the enlarged diameter part 31b in the middle of the pile main-body part 31a can be created.
[0026]
According to the skewer pile forming apparatus according to the present invention as described above, the pair of both-side enlarged-diameter drilling claws 6 and 6 are normally folded in a reduced-diameter posture, and the outer tube 4 is connected to the leader 1 when excavating the enlarged-hole. The inner tube 3 is rotatably connected to the outer tube 4 via a pair of link members 7 and 7 so that the inner tube 3 expands into a diameter-expanded posture by moving the inner tube 3 downward by a predetermined stroke S. The outer pipe 4 moves for a predetermined stroke with respect to the inner pipe 3, and when the diameter S is at the upper limit position of the stroke S, the diameter chamfer 6 for the diameter expansion hole is in the diameter-expanded position, and when it is at the lower limit position, the diameter is reduced. Since it is in a posture, when the enlarged diameter portion 31b of the skewer pile 31 is formed, whether or not the enlarged-hole excavation claw 6 is expanded from the reduced-diameter posture to the expanded posture in the ground protrudes to the ground. The upper end position of the inner pipe 3, for example, the position of the upper end flange portion 19 of the inner pipe 3 is set to the upper end position of the outer pipe 4. It is only necessary to confirm the distance between the upper end flange portion 19 of the inner pipe 3 and the upper end flange portion 18 of the outer pipe 4. Since it has not expanded if it is away, it can be surely grasped whether the diameter expansion part is actually formed in the ground. Further, in this case, by detecting the movement of the inner tube 3 with respect to the outer tube 4 by the position detecting means of the limit switch, the expanded state of the diameter expansion hole excavation claw 6 can be grasped more reliably on the ground.
[0027]
Further, in this skewer pile forming device, when the inner tube 3 rotates forward at the upper end portion of the inner tube 3 in a state in which the digging claw 6 for expanding the diameter hole is folded in a reduced diameter posture, the outer tube 4 with respect to the inner tube 3 The stopper 8 is provided to prevent the upper pipe from moving upward and allow the outer pipe to move upward when the inner pipe 3 is reversed. It can be prevented from opening.
[0028]
Further, in this skewer pile forming device, the inner pipe 3 having the interior 3a as the cement milk supply passage is provided with cement milk discharge ports 23, 24 at the main drilling blade mounting position and the diameter claw mounting claw mounting position, respectively. However, an opening / closing plate 25 is provided at the link member connecting portion of the outer tube 4 for opening / closing the cement milk discharge port 24 at the mounting hole excavation claw mounting position for the enlarged diameter hole. When the diameter expansion hole excavation claw 6 is in the reduced diameter posture, the discharge port 24 is closed, and the inner tube 3 moves downward by a predetermined stroke S with respect to the outer tube 4 so that the diameter expansion hole excavation claw 6 assumes the diameter expansion posture. Since the discharge port 24 is opened at the time, when excavating the diameter expansion hole 30b, cement milk is discharged from the discharge port 24 at the mounting position of the diameter expansion hole excavation claw 6 to obtain a high quality diameter expansion. The portion 31b can be formed, and when excavating the pile body portion forming hole 30a Stops the discharge of cement milk from the discharge port 24 at the drilling claw mounting position for the enlarged diameter hole, and discharges the cement milk only from the discharge port 23 at the main drilling blade mounting position at the tip of the inner pipe 3 Can prevent the discharge of milk.
[0029]
Moreover, in this embodiment, the opening / closing valve 26 which consists of a rubber-like elastic body which bends outward by the supply pressure of the cement milk of the inner pipe | tube inside 3a to the cement milk discharge port 24 in the excavation claw attachment position for diameter expansion holes. Since the opening / closing plate 25 is provided outside the opening / closing valve 26, the cement milk discharge port 24 at the position for attaching the excavation claw for the enlarged diameter hole is securely closed by the opening / closing valve 26 of a rubber-like elastic body. can do.
[0030]
【The invention's effect】
According to the skewer pile forming device of the invention according to claim 1, whether or not the diameter expansion hole excavation claw is expanded from the reduced diameter position to the expanded position in the ground when excavating the diameter expansion hole. The upper end position of the outer pipe protruding to the ground together with the inner pipe may be confirmed on the ground, and if the upper end position of the outer pipe is at the upper limit position close to the upper end position of the inner pipe, the drilling pawl for the enlarged diameter hole is surely If it is in the expanded position and is in the lower limit position away from the upper end position of the inner pipe, it is not expanded, so make sure that the expanded part is actually formed in the ground. I can grasp.
[0031]
According to the skewer pile forming device of the invention according to claim 2, when the inner pipe rotates forward with the digging claw for the diameter expansion hole folded in the reduced diameter posture at the upper end portion of the inner pipe, A stopper is provided to prevent the pipe from moving up and allow the outer pipe to move up when the inner pipe is reversed. Can be prevented.
[0032]
According to the skewer pile forming device of the invention according to claim 3, the cement milk discharge port at the drilling claw mounting position for the enlarged diameter hole is provided with an opening / closing plate for opening and closing this at the link member connecting portion of the outer pipe. This opening / closing plate closes the discharge port when the diameter expansion hole excavation claw is in a reduced diameter position, and when the inner pipe moves down a predetermined stroke with respect to the outer pipe, Since the discharge port is opened, when excavating the expansion hole, cement milk is discharged from the discharge port located at the mounting claw mounting position for the expansion hole to form a high-quality expanded part. When the hole for forming the pile body portion is formed, the discharge of cement milk from the discharge port at the mounting hole mounting claw mounting position is stopped, and the discharge port at the main drilling blade mounting position at the tip of the inner pipe is stopped. Only the cement milk can be discharged and the discharge of excess milk can be prevented.
[0033]
According to the skewer pile forming device of the invention according to claim 4, the rubber-like elasticity that is bent outward by the supply pressure of the cement milk inside the inner pipe is opened to the cement milk discharge port located at the excavation claw mounting position for the expansion hole. Since the on-off valve made of a body is provided and the on-off plate is provided on the outside of the on-off valve, the cement milk discharge port at the attachment position for the diameter claw excavation claw is securely closed by the on-off valve of a rubber-like elastic body. be able to.
[Brief description of the drawings]
FIG. 1 is an overall side view of a skewer pile forming apparatus according to the present invention.
FIGS. 2A to 2D are side views of components of the skewer pile forming apparatus.
FIG. 3 is an enlarged side view of a skewer pile forming apparatus in which a diameter claw for an enlarged hole is in a reduced diameter posture.
FIG. 4 is an enlarged side view of the skewer pile forming apparatus in which the drilling claws for the diameter expansion hole are expanded in the diameter expansion posture.
FIG. 5 is a cross-sectional view showing an outer tube holding and fixing means provided on the steady rest.
FIG. 6A is a longitudinal sectional view showing a state in which the cement milk discharge port at the position of attaching the drilling pawl for the enlarged diameter hole is closed by the opening and closing plate, and FIG. 6B is a view in which the opening and closing plate opens the cement milk discharge port. It is a longitudinal cross-sectional view which shows a state.
[Fig. 7] (1) to (3) are explanatory cross-sectional views showing a skew pile building process by using the skewer pile building device according to the present invention.
FIGS. 8A and 8B are explanatory cross-sectional views showing the skew pile building process following FIG.
FIGS. 9A and 9B are explanatory cross-sectional views showing the skew pile building process following FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Leader 2 Auger machine 3 Inner pipe | tube 4 Outer pipe | tube 5 Main excavation blade 6 Excavation claw for expansion holes 7 Link member 8 Stopper 23 Cement milk discharge port 24 in the inner excavation position of the main excavation blade Cement milk discharge port 25 at excavation claw position Opening / closing plate 26 Opening / closing valve 30a Pile body forming hole 30b Expanding hole 31 Skew pile 31a Pile body 31b Expanding part

Claims

A skewer pile forming device for forming a skew-shaped soil soment pile in the ground with one or a plurality of enlarged diameter portions in the middle of the pile main body, and interlocked with an auger machine that can be moved up and down along the leader The outer tube is fitted to the inner tube so that it can rotate and move up and down, and the main tube is fitted with a main digging blade at the lower end and a claw for an enlarged hole is installed above the main digging blade. The digging claw for a link is normally folded into a reduced diameter posture, and when digging a diameter expansion hole, the link member is expanded so that the inner tube is moved downward by a predetermined stroke while the outer tube is fixed to the leader side. A skewer pile forming device that is rotatably connected to the outer pipe via

At the upper end of the inner pipe, when the inner pipe rotates forward with the diameter claw for the diameter expansion hole folded, the upper pipe is prevented from moving upward with respect to the inner pipe. The skewer pile forming apparatus according to claim 1, further comprising a stopper that allows the outer pipe to move upward relative to the pipe.

Cement milk discharge ports are provided at the main drilling blade mounting position and the expansion claw mounting claw mounting position on the inner pipe whose inside is the cement milk supply path, respectively. An opening and closing plate for opening and closing the outer tube is provided at the link member connecting portion of the outer tube, and this opening and closing plate closes the discharge port when the diameter chamfering claw is in a reduced diameter posture, and the inner tube has a predetermined stroke with respect to the outer tube. The skewer pile forming apparatus according to claim 1 or 2, wherein the discharge port is opened when the excavation claw for a diameter expansion hole is in a diameter expansion posture by moving downward.

An opening / closing valve made of a rubber-like elastic body that bends outward by the supply pressure of the cement milk inside the inner pipe is provided at the cement milk discharge port at the mounting hole for the expansion hole excavation claw. The skewer pile forming apparatus according to claim 3, wherein the opening / closing plate is provided.